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How do you troubleshoot Liebherr crane error code 121 related to outrigger pressure sensor alarm?

MFG-021 · Troubleshooting
Error code 121 indicates outrigger pressure sensor malfunction. Check sensor connections, calibrate pressure readings, and verify hydraulic system pressure.
Liebherr error code 121 signals a fault in the outrigger pressure monitoring system, which is critical for crane stability and load moment calculations. Begin troubleshooting by inspecting all electrical connections to the pressure sensors on each outrigger float. Corrosion, loose connections, or damaged wiring can trigger false alarms.
Reference: Liebherr service manual technical documentation and ASME B30.5 crane inspection requirements
Remember: CPCH: Check Connections, Pressure verify, Calibrate sensors, Hydraulic system inspect for error 121 resolution.

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Liebherr crane error codecrane troubleshootingOEM diagnostics

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